package io.github.enbool.util;

import java.util.HashSet;
import java.util.Set;

import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

public class PropertyUtil {

	/**
	 * 
	 * @Title: getNullPropertyNames  
	 * @Description: 获取一个对象中属性值为null的属性名字符串数组
	 * @param source
	 * @return
	 */
	public static String[] getNullPropertyNames (Object source) {
	    final BeanWrapper src = new BeanWrapperImpl(source);
	    java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();

	    Set<String> emptyNames = new HashSet<String>();
	    for(java.beans.PropertyDescriptor pd : pds) {
	        Object srcValue = src.getPropertyValue(pd.getName());
	        if (srcValue == null) emptyNames.add(pd.getName());
	    }
	    String[] result = new String[emptyNames.size()];
	    return emptyNames.toArray(result);
	}
}
